<!DOCTYPE html>
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>test</title>
    <link rel="stylesheet" th:href="@{/AdminStyle/css/example.css}">
</head>
<style>
    div {
        height: 200px;
        width: 300px;
        background-color: pink;
    }
</style>
<body>
<div class="h"></div>

</body>
</html>